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Mathematical midpoint
Midpoint formula, point A (x 1, y 1) and point B (x2, y2). The midpoint C(x3, y3). x3=(x 1+x2)/2,y3=(y 1+y2)/2 .

At the intersection, the equations of two curves or straight lines can be simultaneous.

Distance formula from point to straight line, d = | ax0+by0+c |/√ (a? +b? )。 Point D(x0, y0), straight line l: ax+by+c = 0.